OCR F212 Evolution

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Page 2

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Module 3: Biodiversity and EvolutionGenetic variation and environmental variation are linked. In the past century, humans have become taller as aresult of a better diet. But however good a diet you have, you are unlikely to grow very tall if all the rest of yourfamily are short. This is because the height you can reach is limited by your genes.…read more

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Module 3: Biodiversity and EvolutionAs all of the offspring are different, some may be better adapted than others. The better adapted individualsobtain enough food and survive long enough to reproduce, passing on their characteristics to the nextgeneration. The less well adapted individuals are likely to die before they reproduce, therefore the populationdoes not grow indefinitely. Over a long period of time, a number of small variations may arise.…read more

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Module 3: Biodiversity and Evolution(i) outline how variation, adaptation and selection are major components of evolution(j) discuss why the evolution of pesticide resistance in insects and drug resistance in microorganisms hasimplications for humans1. There is genetic variation is a population of bacteria/plants as mutation has occurred spontaneously meaningsome bacteria/plants are naturally resistant to antibiotics/pesticides.2. The selective pressure for the population of bacteria/plants is the antibiotic/pesticide.3. The bacteria/plants with resistance will survive.4.…read more